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    Volume 43 Issue 3
    Mar.  2018
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    Wang Jian, Sun Fengyue, Jiang Hefang, Yu Lu, Wang Fei, Ning Chuanqi, Zhang Wanhui, 2018. Age, Petrogenesis and Tectonic Implications of High-Mg Diorite in Chayong Region, Yushu, Qinghai. Earth Science, 43(3): 733-752. doi: 10.3799/dqkx.2018.904
    Citation: Wang Jian, Sun Fengyue, Jiang Hefang, Yu Lu, Wang Fei, Ning Chuanqi, Zhang Wanhui, 2018. Age, Petrogenesis and Tectonic Implications of High-Mg Diorite in Chayong Region, Yushu, Qinghai. Earth Science, 43(3): 733-752. doi: 10.3799/dqkx.2018.904

    Age, Petrogenesis and Tectonic Implications of High-Mg Diorite in Chayong Region, Yushu, Qinghai

    doi: 10.3799/dqkx.2018.904
    • Received Date: 2017-12-13
    • Publish Date: 2018-03-15
    • This paper presents petrography, electron microprobe results, zircon U-Pb dating and geochemistry of diorites at Chayong, Yushu, Qinghai Province, with the aim of constraining its petrogenesis and geodynamic significance. The dating results indicate that the diorite formed in the Late Triassic (230±2 Ma). Electronic Probe analysis results show that plagioclase has a band structure with bytownite and calciclase in the centre, andesine and labradorite on the edge. Biotite belongs to magnesia biotite, which crystallized at temperature of 647-688 ℃, at depth of 14.2-15.5 km.Hornblende belongs to calcic amphibole and has the characteristics of crust-mantle mixing origin of the magma.The diorites contain high SiO2, MgO, Mg# values, Cr and Ni, enriched in large ion lithophile elements (LILEs) and light rare earth elements(LREEs), depleted in the high field strength elements (HFSE), which is similar with high-Mg diorite. The εHf(t) values of zircons from the diorites vary from -10.4 to -10.3 and from -6.4 to -4.0, and their Hf one-stage model ages vary from 1 021 to 1 311 Ma. They are likely formed from mantle peridotites by reacting with Si-rich melts released from subducted oceanic slab. Combined with regional tectonic evolution, it is suggested that the diorites might have been resulted from the subduction of Jinshajiang Ocean in the Late Triassic.

       

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